Top tip would be to WEAR A FANNY PACK WITH A THREE POINT LATCH. This seems so dorky, and sometimes you just have to carry a larger pack, or buy things at the parks that now make the fanny pack less useful - but at MOST Universal cool rides, you will need to put your bags in a locker. This is time confusing and kind of a hassle - so wearing an old fashioned, hideous fanny pack will save you lots of time, multiple times a day.
I managed to wear it and latch the belt at all rides by kind of hoisting it under my bosom at the last moment before latching.